What responsibilities exactly? She literally has no responsibilities in London or at home with her parents. Don't get me wrong of course she missed her family but she chose to go to Cornwall. I live alone and have been working throughout lockdown, had I been furloughed or my job allowed it I would have gone to stay with my parents before lockdown came into force. I didn't have the luxury of a choice.
I don't think she has been taking many precautions during lockdown and since the easing of restrictions. She has driven miles to go shopping and kept ordering stuff online.
The fact of the matter is she thinks the rules don't apply to her and she can travel hundreds of miles to at visit at least two different households and probably didn't socially in either. She also had at least two stops on her journey coming into contact with people but didn't change her clothes when she arrived at her families homes should she have touched anything.